Including Mainland Japan, colonies, occupied territories, and puppet states, the Empire of Japan at its apex was one of the largest empires in history. The total amount of land under Japanese sovereignty reached 8,510,000km2 (3,300,000sqmi) in 1942.[2] By 1943, it accounted for more than 20% of the world's population at the time with 463 million people in its occupied regions and territories.[3][4]
After Japan was defeated by the Allies in 1945, colonial control from Tokyo over the far-flung territories ended. The extent of Japanese governance was restricted to the naichi (excepting Karafuto Prefecture, which was annexed by the Soviet Union); the Nanpō and Ryūkyū Islands were returned to Japan by the US in 1968 and 1972 respectively.
The territorial expansion of the Japanese colonial empire was marked by aggression towards other nations, with the Japanese committing numerous atrocities and war crimes, killing millions.[5]
Maximum extent of the Japanese Empire
Pre-1895
The first overseas territories that Japan acquired were the islands of its surrounding seas. During the early Meiji era, Japan established control over the Nanpō, Ryukyu, and Kuril Islands; it also strengthened control of the naichi. But this effort was less an initial step toward colonial expansion than it was a reassertion of national authority over territories traditionally within the Japanese cultural sphere.[6]
Acquisition of colonies
At the start of the twentieth century the rate of population increase in Japan was seen as a potential problem for the Japanese government, and colonial expansion into Korea and Manchuria was seen as a possible solution.[7]
Since Taiwan was Japan's first overseas colony, the central and colonial governments turned their efforts into making the island a "model colony".[8] These resulted in the modernization of the island's economy, infrastructure, industry, public works, and assimilation of its population.
In the late 19th and early 20th centuries, various Western countries competed for influence, trade, and territory in East Asia, and Japan sought to join these modern colonial powers. The newly modernized Meiji government of Japan turned to Korea, then in the sphere of influence of China's Qing dynasty. The Japanese government initially sought to separate Korea from Qing and make Korea a Japanese satellite to further their security and national interests.[10]
In January 1876, Japan employed gunboat diplomacy to pressure Korea, under the Joseon Dynasty, to sign the Japan–Korea Treaty of 1876, which granted extraterritorial rights to Japanese citizens and opened three Korean ports to Japanese trade. The rights granted to Japan under this unequal treaty,[11] were similar to those granted to western powers in Japan following the visit of Commodore Perry.[11] Japanese involvement in Korea increased during the 1890s, a period of political upheaval.
Korea was occupied and declared a Japanese protectorate following the Japan–Korea Treaty of 1905; it was annexed in 1910 through the annexation treaty. Korea was renamed Chōsen and remained a part of the Empire of Japan for 35 years; from August 22, 1910, until August 15, 1945, upon the surrender of Japan in the Pacific War. The 1905 and 1910 treaties were officially declared "null and void" by both Japan and South Korea in 1965.
During the 19th century, Russia and Japan vied for control of Sakhalin Island. Following the Meiji Restoration in 1868, Japanese settlers were sent to southern Sakhalin to exploit its resources.[12] Japan ceded southern Sakhalin to Russia in 1875 in exchange for the Kuril Islands under the Treaty of Saint Petersburg. After achieving victory in the Russo-Japanese War, Japan was ceded southern Sakhalin under the terms of the Treaty of Portsmouth. Japan established its colonial government in 1907, whereupon South Sakhalin was renamed Karafuto Prefecture.
The main significance of the South Seas Mandate to Japan was its strategic location, which dominated the sea lanes across the Pacific Ocean and provided convenient provisioning locations for ships. During the 1930s, the Imperial Japanese Navy began construction of airfields, fortifications, ports, and other military projects on the South Seas Mandate islands, viewing them as "unsinkable aircraft carriers" with a critical role to play in the defense of the Japanese home islands against potential invasion by the United States. The islands became important staging grounds for Japanese air and naval offensives during the Pacific War but were lost to American military action between 1943 and 1945. The League of Nations mandate was formally revoked by the United Nations on July 18, 1947, according to Security Council Resolution 21, making the United States responsible for administration of the islands under the terms of a United Nations trusteeship agreement which established the Trust Territory of the Pacific Islands.
As a result of Russia's defeat, it also lost influence in Manchuria, which allowed Japan to take its place. In 1906, Japan laid the South Manchuria Railway to Ryojun. Japan temporarily occupied Russian Manchuria in 1918, but returned it to in Soviet Union in 1922. Manchuria came under the control of the Chinese warlord Zhang Zuolin during the warlord period in China. He initially had Japanese backing, but the Kwantung Army found him too independent; he was assassinated in 1928.
The Japanese invasion of Manchuria took place in 1931 following the Mukden Incident, a staged event engineered by Japanese military personnel from the Kwantung Army as a pretext for invasion.[16][17][18] The region was subsequently separated from Chinese control and the Japanese-aligned puppet state of Manchukuo was created.[19] The last Emperor of China, Puyi, was installed as head of state in 1932, and two years later he was declared Emperor of Manchukuo. The city of Changchun was renamed Xinjing and became the capital of Manchukuo. An imperial palace was specially built for the emperor. He was, however, nothing more than a figurehead and real authority rested in the hands of the Japanese military officials. The Manchu ministers all served as front-men for their Japanese vice-ministers, who made all decisions. Anti-Japanese Volunteer Armies were organized by the Chinese in Manchuria and the pacification of Manchukuo required a war lasting several years.
During the 1930s the Japanese colonized Manchukuo. With Japanese investment and rich natural resources, the economy of Manchukuo experienced rapid economic growth. Manchukuo's industrial system became one of the most advanced, making it one of the industrial powerhouses in the region.[20] Manchukuo's steel production exceeded Japan's in the late 1930s. The Japanese Army initially sponsored a policy of forced industrialization modeled after the Five Year Plan in the Soviet Union[21] but subsequently private capital was used in a very strongly state-directed economy. There was progress in the area's social systems and many Manchurian cities were modernized. Manchukuo issued banknotes and postal stamps, and several independent banks were founded. The Chinese Eastern Railway was bought from the Soviet Union In 1935. Traditional lands were taken and redistributed to Japanese farmers with local farmers relocated and forced into collective farming units over smaller areas of land.
During this period Manchukuo was used as a base from which to invade China. In the summer of 1939, a border dispute between Manchukuo and the Mongolian People's Republic resulted in the Battle of Khalkhin Gol. During this battle, a combined Soviet Army and Mongolian force defeated the Japanese Kwantung Army (Kantōgun) supported by limited Manchukuoan forces. The Soviet Union declared war on Japan on 8 August 1945 under the agreement at the Yalta Conference and invaded Manchukuo from Russian Manchuria and Mongolia. This was called Manchurian Strategic Offensive Operation. The Army of Manchukuo was defeated and the Emperor was captured by Soviet forces. Most of the 1.5 million Japanese who had been left in Manchukuo at the end of World War II were sent back to their homeland in 1946-1948 by U.S. Navy ships in the operation now known as the Japanese repatriation from Huludao.
Disclaimer: Not all areas were considered part of the Empire of Japan, but within its sphere of influence, included separately for demographic purposes. Sources: POPULSTAT Asia[3] Oceania[4]
Other islands occupied by Japan during World War II:
Andaman Islands (India) – March 29, 1942 – September 9, 1945
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A shortage of Japanese administrators led to the establishment of colonial puppet states and the promotion of indigenous elites in the territories which came under Japanese control in the 1940s.[22]
Economic development
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According to Atul Kohli, the David K.E. Bruce Professor of International Affairs and Professor of Politics and International Affairs at Princeton, "the Japanese made extensive use of state power for their own economic development and then used the same state power to pry open and transform Korea in a relatively short period of time".[23] Japan was "decisive in altering both the nature of the Korean state and the relationship of this state to various social classes."[24] How the Japanese centralized bureaucratic style of government was transferred to Korea; how they developed Korean human capital by a considerable expansion of education; how the Japanese invested heavily in infrastructure. Kohli's conclusion is that "the highly cohesive and disciplining state that the Japanese helped to construct in colonial Korea turned out to be an efficacious economic actor. The state utilized its bureaucratic capacities to undertake numerous economic tasks: collecting more taxes, building infrastructure, and undertaking production directly. More important, this highly purposive state made increasing production one of its priorities and incorporated property-owning classes into production-oriented alliances".[25] This sprawling bureaucratic state continued post-World War II and after the Korean War. Japan's early colonial industrialisation of Korea also made it easier to rebuild after the Korean War, because there was no need to begin industrialisation ab initio. Examining Korea's policies and achievements in the 1960s and 1970s, Kohli states that during this period the country was firmly heading towards "cohesive-capitalist development, mainly by re-creating an efficacious but brutal state that intervened extensively in the economy".[26] South Korean economic development was not market-driven—rather the "state intervened heavily to promote exports, using both market and non-market tools to achieve its goals".[27]
↑ Rigg, Bryan Mark (2024). Japan's Holocaust: History of Imperial Japan's Mass Murder and Rape During World War II. Knox Press. pp.190–191, 276, 312. ISBN9781637586884.
↑ "The Nation, Volume 74". The Nation. Vol.LXXIV. New York: New York Evening Post Company. 1902. p.187. Retrieved 20 December 2011. In all the ameliorating conditions every one must rejoice; but when these are coupled with the old-time lack of self-control leading to universal early marriages, a problem is rolling up before which Japanese statesmen are appalled. At the present rate of increase, there will, before the middle of this century, be a hundred million people to provide for. It is this prospect that is leading Japanese statesmen to make such frantic efforts to secure opportunity for colonization. Being practically shut off from going to other foreign countries, and Formosa being already largely occupied, Japan would naturally look to Korea and Manchuria; but of these places, Korea would afford only partial relief, both because of its limited area and of its present population. The northern region of Manchuria, however, is still almost as much in a state of nature as were the prairies of the Mississippi valley when the Indians roamed freely over them.
↑ Maiolo, Joseph Cry Havoc How the Arms Race Drove the World to War, 1931-1941, New York: Basic Books, 2010 page 30
↑ Plowright, John (2007). The causes, course and outcomes of World War Two. Histories and Controversies. Basingstoke: Palgrave Macmillan. p.167. ISBN978-0-333-79345-9. Retrieved 2010-08-29. The success of the Japanese had other consequences for Britain's—and others'—former colonies. Lacking sufficient numbers of skilled personnel to administer their newly conquered lands, they sometimes either set up puppet governments or entrusted relatively high administrative responsibilities to the local native élites whom the former colonial powers had hitherto systematically kept in lower grade jobs[...]
Maiolo, Joseph (2010). Cry Havoc How the Arms Race Drove the World to War, 1931–1941, New York: Basic Books.
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Manchukuo was a puppet state of the Empire of Japan in Northeast China that existed from 1932 until its dissolution in 1945. It was ostensibly founded as a republic, its territory consisting of the lands seized in the Japanese invasion of Manchuria; it was later declared to be a constitutional monarchy in 1934, though very little changed in the actual functioning of government. Manchukuo received limited diplomatic recognition, mostly from states aligned with the Axis powers, with its existence widely seen as illegitimate.
The Empire of Japan, also referred to as the Japanese Empire, Imperial Japan, or simply Japan, was the Japanese nation-state that existed from the Meiji Restoration in 1868 until the enactment of the reformed Constitution of Japan in 1947. From 29 August 1910 until 2 September 1945, it administered the naichi and the gaichi. The South Seas Mandate was a single Japanese dependent territory in the name of the League of Nations under Japanese administration. In the closing stages of World War II, with Japan defeated alongside the rest of the Axis, the formalized Japanese Instrument of Surrender was issued in compliance with the Potsdam Declaration of the victorious Allies, and Japanese de facto territory subsequently shrunk to cover only the Japanese archipelago as it is today.
The Greater East Asia Co-Prosperity Sphere, also known as the GEACPS, was a pan-Asian union that the Japanese Empire tried to establish. Initially, it covered Japan, Manchukuo, and China, but as the Pacific War progressed, it also included territories in Southeast Asia. The term was first coined by Minister for Foreign Affairs Hachirō Arita on June 29, 1940.
The South Manchuria Railway, officially The South Manchuria Railway Company, Ltd., Mantetsu or Mantie for short, was a large National Policy Company of the Empire of Japan whose primary function was the operation of railways on the Dalian–Fengtian (Mukden)–Changchun corridor in northeastern China, as well as on several branch lines.
The Mukden incident was a false flag event staged by Japanese military personnel as a pretext for the 1931 Japanese invasion of Manchuria.
The Kwantung Leased Territory was a leased territory of the Empire of Japan in the Liaodong Peninsula from 1905 to 1945.
Army was a term in the Imperial Japanese Army was used in different ways to designate a variety of large military formations that corresponded to the army group, field army, and corps in the militaries of Western nations.
Karafuto Agency, from 1943 Karafuto Prefecture, commonly known as South Sakhalin, was a colony of the Empire of Japan on Sakhalin from 1907 to 1943 and later a prefecture until 1945.
The Soviet invasion of Manchuria, formally known as the Manchurian Strategic Offensive Operation or simply the Manchurian Operation, began on 9 August 1945 with the Soviet invasion of the Japanese puppet state of Manchukuo. It was the largest campaign of the 1945 Soviet–Japanese War, which resumed hostilities between the Union of Soviet Socialist Republics and the Empire of Japan after almost six years of peace. Since 1983, the operation has sometimes been called Operation August Storm after U.S. Army historian David Glantz used this title for a paper on the subject.
The South Seas Mandate, officially the Mandate for the German Possessions in the Pacific Ocean Lying North of the Equator, was a League of Nations mandate in the "South Seas" given to the Empire of Japan by the League of Nations following World War I. The mandate consisted of islands in the north Pacific Ocean that had been part of German New Guinea within the German colonial empire until they were occupied by Japan during World War I. Japan governed the islands under the mandate as part of the Japanese colonial empire until World War II, when the United States captured the islands. The islands then became the United Nations–established Trust Territory of the Pacific Islands governed by the United States. The islands are now part of Palau, the Northern Mariana Islands, the Federated States of Micronesia, and the Marshall Islands.
The population of Japan at the time of the Meiji Restoration was estimated to be 34,985,000 on January 1, 1873, while the official original family registries and de facto populations on the same day were 33,300,644 and 33,416,939, respectively. These were comparable to the population of the United Kingdom (31,000,000), France (38,000,000), and Austria-Hungary (38,000,000).
The Soviet–Japanese War, known in Mongolia as the Liberation War of 1945, was a campaign of the Second World War that began with the Soviet invasion of Japanese-occupied territory following the Soviet declaration of war against Japan on 7 August 1945. The Soviet Union and Mongolian People's Republic toppled the Japanese puppet states of Manchukuo in Manchuria and Mengjiang in Inner Mongolia, as well as northern Korea, Karafuto on the island of Sakhalin, and the Kuril Islands. The defeat of Japan's Kwantung Army helped bring about the Japanese surrender and the end of World War II. The Soviet entry into the war was a significant factor in the Japanese government's decision to surrender unconditionally, as it was made apparent that the Soviet Union was not willing to act as a third party in negotiating an end to hostilities on conditional terms.
The Ministry of Colonial Affairs was a cabinet-level government ministry of the Empire of Japan from 1929 to 1942.
The decolonisation of Asia was the gradual growth of independence movements in Asia, leading ultimately to the retreat of foreign powers and the creation of several nation-states in the region.
The Kwantung Army was a general army of the Imperial Japanese Army from 1919 to 1945.
The Imperial Japanese Armed Forces (IJAF) were the unified forces of the Empire of Japan. Formed during the Meiji Restoration in 1868, they were disbanded in 1945, shortly after Japan's defeat to the Allies of World War II; the revised Constitution of Japan, drafted during the Allied occupation of Japan, replaced the IJAF with the present-day Japan Self-Defense Forces.
The Soviet occupation of Manchuria took place after the Red Army invaded the Japanese puppet state of Manchukuo in August 1945; the occupation would continue until Soviet forces withdrew in May 1946.
Hokushin-ron was a political doctrine of the Empire of Japan before World War II that stated that Manchuria and Siberia were Japan's sphere of interest and that the potential value to Japan for economic and territorial expansion in those areas was greater than elsewhere. Its supporters were sometimes called the Strike North Group.
Japan during World War II refers to the history of the Empire of Japan during World War II. This includes the invasion of the Republic of China, the annexation of French Indochina and the subsequent invasion of British India, the Pacific War and the Surrender of Japan.
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